Guseva, L. G. and Solomonovich, M. (2017) “Implementing the zone of proximal development: From the pedagogical experiment to the developmental education system of Leonid Zankov”, International Electronic Journal of Elementary Education, 9(4), pp. 775–786. Available at: https://iejee.com/index.php/IEJEE/article/view/284 (Accessed: 29January2025).